95 lines
2.3 KiB
JavaScript
95 lines
2.3 KiB
JavaScript
/**
|
|
* @license Apache-2.0
|
|
*
|
|
* Copyright (c) 2018 The Stdlib Authors.
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
'use strict';
|
|
|
|
// MODULES //
|
|
|
|
var isString = require( '@stdlib/assert/is-string' ).isPrimitive;
|
|
var isArray = require( '@stdlib/assert/is-array' );
|
|
var isObjectLike = require( '@stdlib/assert/is-object-like' );
|
|
var copy = require( './../../copy' );
|
|
var validate = require( './validate.js' );
|
|
var defaults = require( './defaults.json' );
|
|
var dget = require( './dget.js' );
|
|
|
|
|
|
// MAIN //
|
|
|
|
/**
|
|
* Returns a function for retrieving a nested property value.
|
|
*
|
|
* @param {(string|Array)} path - key path
|
|
* @param {Options} [options] - function options
|
|
* @param {string} [options.sep='.'] - key path separator
|
|
* @throws {TypeError} first argument must be a string primitive or key array
|
|
* @throws {TypeError} options argument must be an object
|
|
* @throws {TypeError} must provide valid options
|
|
* @returns {Function} deep get function
|
|
*
|
|
* @example
|
|
* var dget = factory( 'a/b/c', {
|
|
* 'sep': '/'
|
|
* });
|
|
*/
|
|
function factory( path, options ) {
|
|
var isStr;
|
|
var props;
|
|
var opts;
|
|
var err;
|
|
isStr = isString( path );
|
|
if ( !isStr && !isArray( path ) ) {
|
|
throw new TypeError( 'invalid argument. Key path must be a string primitive or a key array. Value: `' + path + '`.' );
|
|
}
|
|
opts = copy( defaults );
|
|
if ( arguments.length > 1 ) {
|
|
err = validate( opts, options );
|
|
if ( err ) {
|
|
throw err;
|
|
}
|
|
}
|
|
if ( isStr ) {
|
|
props = path.split( opts.sep );
|
|
} else {
|
|
props = path;
|
|
}
|
|
return deepGet;
|
|
|
|
/**
|
|
* Returns a nested property value.
|
|
*
|
|
* @private
|
|
* @param {ObjectLike} obj - input object
|
|
* @returns {*} nested property value
|
|
*
|
|
* @example
|
|
* var obj = { 'a': { 'b': { 'c': 'd' } } };
|
|
* var val = deepGet( obj );
|
|
*/
|
|
function deepGet( obj ) {
|
|
if ( isObjectLike( obj ) ) {
|
|
return dget( obj, props );
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
// EXPORTS //
|
|
|
|
module.exports = factory;
|